Athletic training sled base



FIG. 1 shows a top perspective view of my claimed design.

FIG. 2 shows a bottom perspective view of my claimed design.

FIG. 3 shows a front view thereof.

FIG. 4 shows a rear view thereof.

FIG. 5 shows a right side view thereof; and,

FIG. 6 shows a left side view thereof. 

The ornamental design for an athletic training sled base, as shown and described. 